While Apple created a new icloud.com email address for anyone who had a mac.com or me.com address in the past, any one of those three domain prefixes can be used. An email sent to tuawblogger@icloud.com, for example, appears in any tuawblogger@me.com or tuawblogger@mac.com inbox as well. Here's the text of the Apple email:

All new iCloud Mail accounts now come with an @icloud.com email address. As an existing user, we'd like to offer you this new address as well. We have reserved [MobileMe user name]@icloud.com for you, and you can now use this address with your iOS devices and computers by following these simple instructions.

If you prefer, you can continue to use your current email address just as you always have.

No matter which address you use, you'll continue to receive all your mail, whether it's sent to your @me.com, @mac.com, or @icloud.com address.

For many of us, we'll keep the me.com or mac.com address ... but thanks for asking, Apple.